^^I can vouch for this program. I attended last year and found it both enjoyable and really helpful. The instructors were company dancers and really generally great people.
Conditioning class was fantastic, technique class was very focused and effective, but I think the highlight for me was the opportunity to learn and perform variations. The ladies learned portions of the "Kingdom of the Shades" from La Bayadere; the two of us in the men's class learned the act I male peasant pas (reset for two dancers) and Albrecht's variation (in its usual solo form) from Giselle.
Dates for this year aren't posted yet, but I'll definitely be going back unless the dates overlap with another intensive I'm already committed to.
In the modern department, Mam-Luft & Co in Cincinnati also offers one heck of a good intensive (http://mamluftcodance.org/intensive/). Went to that one last year, too; the ballet class alone would've been worth the cost and time commitment, but the whole thing was fantastic. 6-8 hours per day of dancing, daily masterclass with amazing dancers and teachers from around the country, options for rep or composition (I took rep; it was awesome). I seriously doubt that I've ever been fitter in my life than I was when I got home from Cinci. Very, very physically demanding, but a great experience.
2017 dates for Mam-Luft & Co are June 5 - 9 (registration isn't open yet).